Aasta | 1994 |
---|---|
Raamat | Ordovician Carbonate Platform Ecosystem of the Holy Cross Mountains |
Ajakiri | Palaeontologia Polonica |
Köide | 53 |
Leheküljed | 283-307 |
Tüüp | artikkel ajakirjas |
Keel | inglise |
Id | 33543 |
Abstrakt
The material of disarticulated phosphat ized echinoderm ossic1es from the Ordovician M6jcza Limestone (at its type section at M6jcza, Holy Cross Mount ains) is described. Because of the character of preservation, most of the ossic1es have been assigned only to higher taxonomical groups; the most common are crinoid (camerates and inadunates) ossic1es (mostly stem ossicles and brachials, but also thec al plates), and cystoid stems and plates (glyptocys tid cystoids are dominant). Also common are asterozoan plates (mostly ambulacral and adambulacral) and stylophoran ossic1es. Less common are fragments of eocrin oids and coronates. A doubtful holothurian plate has also been noted . Stratigraphic distribut ion of ossic1es seems to have been primarily controlled by the processes of sedimentation and phosphati zation . Numerou s forms, especially among crinoids and supposed cystoids, are common with those from Baitoscandia, but stylophorans suggest southern European and perhap s also North American influences. Among the investigated material there are the olde st noted occurrences of Bothriocidaris and coronates, as well as the youngest known occurrence of epispire-bearing eocrinoids.